Graduate Thesis Or Dissertation
 

Superconductive A.C. losses as a function of an applied steady magnetic field in type II superconductors

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  • Measurements were made of the energy loss in a superconducting wire coil subjected to an axial magnetic field consisting of a ripple field superimposed on a steady field. The loss was measured calorimetrically using a sonic thermometer consisting of a resonance tube filled with helium gas in thermal contact with the superconducting wire under test. An adiabatic calorimeter and an almost isothermal calorimeter were constructed to measure the losses and their respective results were compared. The critical state theory of Kim, Hempstead and Strnad predicts the experimentally determined loss characteristics. The loss-vs-steady field characteristic was measured for Niobium, 25 wt percent Zirconium, 10 MIL wire. General agreement with Kim's theory was found with a maximum loss occurring at 254,000 ampere-turns per meter, such loss falling to a lower and constant value at fields above 795,000 ampere-turns per meter.
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